CN102841366A - Method and system for detecting discrimination threshold of pulse-amplitude discriminator - Google Patents
Method and system for detecting discrimination threshold of pulse-amplitude discriminator Download PDFInfo
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- CN102841366A CN102841366A CN2012103208765A CN201210320876A CN102841366A CN 102841366 A CN102841366 A CN 102841366A CN 2012103208765 A CN2012103208765 A CN 2012103208765A CN 201210320876 A CN201210320876 A CN 201210320876A CN 102841366 A CN102841366 A CN 102841366A
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Abstract
The invention belongs to the technical field of nuclear radiation measurement and specifically relates to a method and system for detecting the discrimination threshold of a pulse-amplitude discriminator. The method comprises the following steps of: measuring the pulse amplitude spectrum of a nuclear radiation detector by using a multi-channel pulse amplitude analyzer, determining a point M corresponding to the discrimination threshold in the pulse amplitude spectrum, substituting a cross coordination channel address m' corresponding to the discrimination point M in a multi-channel pulse amplitude analyzer channel address, calculating out the best threshold value A' in coordination with the voltage value transformation formula, and adjusting the threshold value of the discriminator to be the best threshold value A'. According to the invention, the threshold value detection is performed by using the pulse amplitude spectrum; and compared with the traditional detection method in which an integral curve is used, the method provided by the invention has the following advantages of short measurement time and high accuracy.
Description
Technical field
The invention belongs to the nuclear radiation measurement technical field, be specifically related to a kind of pulse-amplitude discriminator discrimination threshold assay method and system.
Background technology
The research in nuclear field is to launch around these microscopic particles of neutron, proton, alpha ray, β ray, gamma-rays, heavy particle and X-ray, and the size of these microscopic particles is 10
-15M and following magnitude thereof, human eye can't directly be observed at all, need survey by the nuclear radiation detector of special use.Nuclear radiation detector and subsequent nuclear electronics system become observable electric signal with these microscopic particle conversion of signals.The nuclear radiation ionization meter is one of nuclear radiation detection routine work.Most of nuclear radiation detections for the cancelling noise signal obtains pure nuclear signal, have pulse height to screen and the pulse-shape discrimination dual mode all with noise signal, are suitable for dissimilar detectors respectively.Pulse-amplitude discriminator is the core component that pulse height is screened mode, adopts the nuclear radiation strength measurement system hardware configuration of pulse height examination mode as shown in Figure 1.The discrimination threshold of pulse-amplitude discriminator is regulated according to concrete experiment condition, and the pulse height of noise signal is smaller, and the pulse height of nuclear signal is bigger, and suitable discrimination threshold can be removed noise signal as much as possible, can write down nuclear signal as much as possible again.The integrated curve assay method is traditional pulse-amplitude discriminator discrimination threshold assay method, and its hardware configuration is as shown in Figure 2.Under the condition of parameter constants such as detector high pressure, amplifier magnification ratio, time constant; Regulate discriminator (or single channel pulse height analyzer works in integral way) threshold value from small to large behind the loading radiation source and read counting rate (or fixation measuring time counting) through scaler, meter digit rate (or fixation measuring time counting) is an integrated curve with the curve of discriminator changes of threshold.The integrated curve that records is as shown in Figure 3, and threshold value is got the intermediate value that changes slow segment of curve (being referred to as to count the level ground) (position shown in the downward arrow among Fig. 3).The integrated curve assay method must carry out multimetering, and certain interval is arranged between the each point, and its shortcoming is that Measuring Time is long, poor accuracy.
Summary of the invention
The objective of the invention is to defective,, a kind of Measuring Time is short, accuracy is high pulse-amplitude discriminator discrimination threshold assay method and system are provided based on the principle of multichannel pulse scope-analyzer to prior art.
Technical scheme of the present invention is following: a kind of pulse-amplitude discriminator discrimination threshold assay method comprises the steps:
(1) under the constant condition of nuclear radiation detector high pressure, amplifier magnification ratio, time constant; Measure the pulse amplitude spectrum of nuclear radiation detector through multichannel pulse scope-analyzer; The horizontal ordinate of said pulse amplitude spectrum is the road number of multichannel pulse scope-analyzer, and ordinate is the counting of multichannel pulse scope-analyzer;
(2) in said pulse amplitude spectrum, confirm pairing some M of discrimination threshold, m ' the substitution location, multichannel pulse scope-analyzer road, location, horizontal ordinate road and the magnitude of voltage transformation for mula A=pm+A of the multichannel pulse scope-analyzer that discrimination threshold M point is corresponding
0, obtain optimal threshold A ',
Wherein, m is the location, and A is the m corresponding voltage value, and p is a coefficient, A
0Be constant;
(3) with the threshold value adjustment of discriminator to optimal threshold A '.
Further; Aforesaid pulse-amplitude discriminator discrimination threshold assay method; Discrimination threshold M point described in the step (2) is positioned at the counting paddy the lowest point of pulse amplitude spectrum, and described counting paddy is meant one section zone that counting is lower between the nuclear signal and noise signal in the pulse amplitude spectrum.
Further; Aforesaid pulse-amplitude discriminator discrimination threshold assay method; The threshold value adjustment with discriminator described in the step (3) is following to the method for optimal threshold A ': use signal generator to import square-wave pulse signal to main amplifier; Use oscillograph to observe main amplifier output, regulate the square-wave pulse signal amplitude, making the main amplifier output amplitude is the pulse signal of A '; Use oscillograph to observe the output of the discriminator that is connected with main amplifier, the threshold value of discriminator is regulated from small to large, till discriminator did not just have pulse signal output, this moment, the actual threshold of discriminator was adjusted to optimal threshold A '.
A kind of pulse-amplitude discriminator discrimination threshold is measured system; Comprise pulse amplitude spectrum measurement mechanism and discriminator threshold value adjustment device; Described pulse amplitude spectrum measurement mechanism comprises nuclear radiation detector, and nuclear radiation detector connects prime amplifier and main amplifier in order, and high-voltage power supply is transferred on the nuclear radiation detector through prime amplifier; Main amplifier is connected with multichannel pulse scope-analyzer, and multichannel pulse scope-analyzer connects computing machine; Described discriminator threshold value adjustment device comprises signal generator, and signal generator is connected with main amplifier, and main amplifier connects amplitude discriminator and oscillograph respectively, and amplitude discriminator is connected with oscillograph.
Beneficial effect of the present invention is following: the present invention adopts the pulse amplitude spectrum assay method to survey pulse amplitude spectrum and takes time and only need the integrated curve assay method to measure once to count to take time, so Measuring Time shortens greatly.The pulse amplitude spectrum assay method is surveyed pulse amplitude spectrum and is once accomplished, and has therefore rejected the measuring error that the radiation source statistic fluctuation causes, the accuracy that helps improving threshold value determination.The pulse amplitude spectrum assay method uses multichannel pulse scope-analyzer, and the about several mV in road wide (at interval) have rejected the error that each point brings at interval in the integrated curve assay method basically, and the accuracy that helps improving threshold value determination is particularly effective when narrow on the counting level ground.
Description of drawings
Fig. 1 is a nuclear radiation strength measurement system hardware configuration synoptic diagram;
Fig. 2 is an integrated curve assay method hardware configuration synoptic diagram;
Fig. 3 is the integrated curve synoptic diagram;
Fig. 4 is a method flow diagram of the present invention;
Fig. 5 is a pulse amplitude spectrum assay method hardware configuration synoptic diagram;
Fig. 6 is the pulse amplitude spectrum synoptic diagram.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is carried out detailed description.
The hardware configuration of the mensuration system that the present invention adopted is as shown in Figure 5, comprises pulse amplitude spectrum measurement mechanism (a part among Fig. 5) and discriminator threshold value adjustment device (b part among Fig. 5).Described pulse amplitude spectrum measurement mechanism comprises nuclear radiation detector; Nuclear radiation detector connects prime amplifier and main amplifier in order; High-voltage power supply is transferred on the nuclear radiation detector through prime amplifier; Main amplifier is connected with multichannel pulse scope-analyzer, and multichannel pulse scope-analyzer connects computing machine; Described discriminator threshold value adjustment device comprises signal generator, and signal generator is connected with main amplifier, and main amplifier connects amplitude discriminator and oscillograph respectively, and amplitude discriminator is connected with oscillograph.
As shown in Figure 4, pulse-amplitude discriminator discrimination threshold assay method provided by the invention comprises the steps:
(1) hardware configuration of employing Fig. 5 (a); Under the constant condition of nuclear radiation detector high pressure, amplifier magnification ratio, time constant; Load radiation source, through the pulse amplitude spectrum of multichannel pulse scope-analyzer measurement nuclear radiation detector, pulse amplitude spectrum is as shown in Figure 6; The horizontal ordinate of said pulse amplitude spectrum is the road number of multichannel pulse scope-analyzer, and ordinate is the counting of multichannel pulse scope-analyzer.
Nuclear signal is positioned at the right side of spectrum, and noise signal is positioned at the left side of spectrum, and one section zone that counting is lower is arranged between nuclear signal and the noise signal, is called counting paddy.Threshold value fixes on counting paddy the lowest point, and promptly the minimum place of counting generally is positioned at counting paddy centre position, M point as shown in Figure 6.
(2) in said pulse amplitude spectrum, confirm pairing some M of discrimination threshold, m ' the substitution location, multichannel pulse scope-analyzer road, location, horizontal ordinate road and the magnitude of voltage transformation for mula A=pm+A of the multichannel pulse scope-analyzer that discrimination threshold M point is corresponding
0, obtain optimal threshold A ',
Wherein, m is the location, and A is the m corresponding voltage value, and p is a coefficient, A
0Be constant;
(3) with the threshold value adjustment of discriminator to optimal threshold A '.
Obtain optimal threshold A ', need the threshold value adjustment of discriminator be worth to this.Hardware configuration is shown in Fig. 5 (b), and the threshold value adjustment of discriminator needs by signal generator and oscillograph.Parameter constants such as main amplifier enlargement factor, time constant; Use signal generator to import square-wave pulse signal to main amplifier; Use oscillograph to observe main amplifier output, regulate the square-wave pulse signal amplitude, making the main amplifier output amplitude is the pulse signal of A '.Use oscillograph to observe discriminator output; The threshold value of discriminator is regulated from small to large (minimum value that the starting point of adjusting is discriminator adjustable threshold value joint); Till discriminator does not just have pulse signal output, explain that the actual threshold of discriminator has been adjusted to optimal threshold A '.
Embodiment
Nuclear radiation detector uses
3The He proportional counter tube, radiation source uses
241The Am-Be isotope neutron source uses the pulse amplitude spectrum assay method to measure the amplitude discriminator discrimination threshold.The measurement flow process is as shown in Figure 4, and its hardware configuration is as shown in Figure 5, under the condition of parameter constants such as detector high pressure, amplifier magnification ratio, time constant, loads
241The Am-Be isotope neutron source is measured
3The pulse amplitude spectrum of He proportional counter tube (hardware configuration is shown in Fig. 5 a), the result is as shown in Figure 6.Neutron signal is positioned at the right side of spectrum, and noise (gamma noise and electronics noise) is positioned at the left side of spectrum, and one section zone that counting is lower is arranged between neutron signal and the noise, is called counting paddy (as shown in Figure 6).Threshold value fixes on counting paddy the lowest point, and promptly the minimum place of counting generally is positioned at counting paddy centre position, M point as shown in Figure 6.The location, horizontal ordinate road 240 of the fixed corresponding multichannel pulse scope-analyzer of discrimination threshold M point, (this formula is provided by the instructions of multichannel pulse scope-analyzer with 240 locations, substitution multichannel pulse scope-analyzer road, location, road and magnitude of voltage transformation for mula A=0.0049m+0.069; M is the location, and A is the m corresponding voltage value), obtain optimal threshold 1.245V.
Obtain optimal threshold 1.245V, need the threshold value adjustment of discriminator be worth to this.Hardware configuration is shown in Fig. 5 b, and the threshold value adjustment of discriminator needs by signal generator and oscillograph.Parameter constants such as main amplifier enlargement factor, time constant; Use signal generator to import square-wave pulse signal to main amplifier; Use oscillograph to observe main amplifier output, regulate the square-wave pulse signal amplitude, making the main amplifier output amplitude is the pulse signal of 1.245V.Use oscillograph to observe discriminator output; The threshold value of discriminator is regulated from small to large; Till discriminator does not just have pulse signal output, explain that the actual threshold of discriminator has been adjusted to optimal threshold 1.245V, this moment, the display threshold of discriminator was 1.19V.
The prime amplifier model QF07 that uses in the present embodiment, main amplifier model BH1218, multichannel pulse scope-analyzer model 2048, signal generator model SU5102, amplitude discriminator model BH1299A, oscillograph model TDS2024.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technology thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (4)
1. a pulse-amplitude discriminator discrimination threshold assay method comprises the steps:
(1) under the constant condition of nuclear radiation detector high pressure, amplifier magnification ratio, time constant; Measure the pulse amplitude spectrum of nuclear radiation detector through multichannel pulse scope-analyzer; The horizontal ordinate of said pulse amplitude spectrum is the road number of multichannel pulse scope-analyzer, and ordinate is the counting of multichannel pulse scope-analyzer;
(2) in said pulse amplitude spectrum, confirm pairing some M of discrimination threshold, m ' the substitution location, multichannel pulse scope-analyzer road, location, horizontal ordinate road and the magnitude of voltage transformation for mula A=pm+A of the multichannel pulse scope-analyzer that discrimination threshold M point is corresponding
0, obtain optimal threshold A ',
Wherein, m is the location, and A is the m corresponding voltage value, and p is a coefficient, A
0Be constant;
(3) with the threshold value adjustment of discriminator to optimal threshold A '.
2. pulse-amplitude discriminator discrimination threshold assay method as claimed in claim 1; It is characterized in that: the discrimination threshold M point described in the step (2) is positioned at the counting paddy the lowest point of pulse amplitude spectrum, and described counting paddy is meant one section zone that counting is lower between the nuclear signal and noise signal in the pulse amplitude spectrum.
3. according to claim 1 or claim 2 pulse-amplitude discriminator discrimination threshold assay method; It is characterized in that: the threshold value adjustment with discriminator described in the step (3) is following to the method for optimal threshold A ': use signal generator to import square-wave pulse signal to main amplifier; Use oscillograph to observe main amplifier output; Regulate the square-wave pulse signal amplitude, making the main amplifier output amplitude is the pulse signal of A '; Use oscillograph to observe the output of the discriminator that is connected with main amplifier, the threshold value of discriminator is regulated from small to large, till discriminator did not just have pulse signal output, this moment, the actual threshold of discriminator was adjusted to optimal threshold A '.
4. a pulse-amplitude discriminator discrimination threshold is measured system; It is characterized in that: comprise pulse amplitude spectrum measurement mechanism and discriminator threshold value adjustment device; Described pulse amplitude spectrum measurement mechanism comprises nuclear radiation detector, and nuclear radiation detector connects prime amplifier and main amplifier in order, and high-voltage power supply is transferred on the nuclear radiation detector through prime amplifier; Main amplifier is connected with multichannel pulse scope-analyzer, and multichannel pulse scope-analyzer connects computing machine; Described discriminator threshold value adjustment device comprises signal generator, and signal generator is connected with main amplifier, and main amplifier connects amplitude discriminator and oscillograph respectively, and amplitude discriminator is connected with oscillograph.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103412319A (en) * | 2013-08-19 | 2013-11-27 | 中国科学院高能物理研究所 | Detector signal processing method and device based on pulse width spectrum |
| CN104749603A (en) * | 2015-03-14 | 2015-07-01 | 华北电力大学（保定） | Nuclear radiation detection method suitable for complex radiation background |
| CN107490585A (en) * | 2017-09-30 | 2017-12-19 | 衡阳师范学院 | It is a kind of to eliminate method and device of the temperature to Si PIN detectors ɑ energy spectral peak drift effects |
| CN109975854A (en) * | 2017-12-27 | 2019-07-05 | 同方威视技术股份有限公司 | Method and system for pulse shape discriminator |
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| CN101713829A (en) * | 2009-12-22 | 2010-05-26 | 清华大学 | Rapid spectrum stabilization method and device for ray energy spectrometer |
| CN102338880A (en) * | 2011-06-02 | 2012-02-01 | 中国科学技术大学 | Nuclear pulse amplitude digitizing method and system |
| US20120121050A1 (en) * | 2010-05-03 | 2012-05-17 | Brookhaven Science Associates, Llc | Method and Apparatus for Analog Pulse Pile-Up Rejection |
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| CN101713829A (en) * | 2009-12-22 | 2010-05-26 | 清华大学 | Rapid spectrum stabilization method and device for ray energy spectrometer |
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| CN102338880A (en) * | 2011-06-02 | 2012-02-01 | 中国科学技术大学 | Nuclear pulse amplitude digitizing method and system |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103412319A (en) * | 2013-08-19 | 2013-11-27 | 中国科学院高能物理研究所 | Detector signal processing method and device based on pulse width spectrum |
| CN104749603A (en) * | 2015-03-14 | 2015-07-01 | 华北电力大学（保定） | Nuclear radiation detection method suitable for complex radiation background |
| CN107490585A (en) * | 2017-09-30 | 2017-12-19 | 衡阳师范学院 | It is a kind of to eliminate method and device of the temperature to Si PIN detectors ɑ energy spectral peak drift effects |
| CN107490585B (en) * | 2017-09-30 | 2018-07-31 | 衡阳师范学院 | It is a kind of to eliminate method and device of the temperature to Si-PIN detectors ɑ energy spectral peak drift effects |
| CN109975854A (en) * | 2017-12-27 | 2019-07-05 | 同方威视技术股份有限公司 | Method and system for pulse shape discriminator |
| CN109975854B (en) * | 2017-12-27 | 2020-12-11 | 同方威视技术股份有限公司 | Method and system for pulse waveform discrimination |
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